Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 910 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.172 decreased by 50% =
2. 2.624 decreased by 25% =
3. 3.200 increased by 60% =
4. 4.540 increased by 60% =
5. 5.650 increased by 40% =
6. 6.95 decreased by 40% =
7. 7.630 decreased by 10% =
8. 8.740 increased by 30% =
9. 9.450 decreased by 8% =
10. 10.100 decreased by 60% =
11. 11.148 decreased by 50% =
12. 12.240 decreased by 60% =
13. 13.600 increased by 8% =
14. 14.320 decreased by 50% =
15. 15.640 increased by 10% =
16. 16.110 decreased by 30% =
17. 17.40 decreased by 15% =
18. 18.240 increased by 25% =
19. 19.560 decreased by 5% =
20. 20.160 decreased by 15% =
21. 21.195 increased by 40% =
22. 22.360 decreased by 75% =
23. 23.775 increased by 8% =
24. 24.600 decreased by 15% =
25. 25.585 increased by 40% =
26. 26.380 increased by 15% =
27. 27.460 increased by 35% =
28. 28.440 increased by 5% =
29. 29.540 increased by 15% =
30. 30.755 decreased by 20% =
31. 31.60 increased by 20% =
32. 32.325 increased by 12% =
33. 33.504 decreased by 75% =
34. 34.220 increased by 35% =
35. 35.640 decreased by 15% =
36. 36.536 increased by 50% =
37. 37.140 decreased by 15% =
38. 38.140 decreased by 35% =
39. 39.775 increased by 8% =
40. 40.380 increased by 35% =

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